Fix an issue that P0 is not currently implemented in TinyG and G2core (#191)
Fix an issue that P0 is not currently implemented in TinyG and G2core (#191)

cheton/piduino-grbl,cncjs/cncjs,cncjs/cncjs,cheton/cnc,cheton/cnc,cncjs/cncjs,cheton/piduino-grbl,cheton/cnc,cheton/cnc.js,cheton/cnc.js,cheton/piduino-grbl,cheton/cnc.js